Synergy provided groundwater extraction, excavation, dewatering, surface stormwater collection, water treatment, sludge dewatering, immobilisation, waste management and various remediation services for the Barangaroo redevelopment site. Barangaroo was Australia’s first gasworks providing Sydney’s electricity supply between 1839 and 1928. After it was decommissioned the area was used as a commercial wharf built on reclaimed land using landfill.